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The MIT OpenCourseWare project is pretty amazing. The direct URL is http://ocw.mit.edu/index.html

From their Announcement:
The official "launch" of MIT OpenCourseWare, with the publication of 512 courses, came on September 30, 2003. We hope that you are finding material that interests you among these courses, which come from all 33 of MIT's academic disciplines.

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